Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

High viscous gear pump

High viscous gear pump

High viscous gear pump

I have 25,000 cp viscous liquid, I started transferring this liquid with a gear pump at 18 Hz with 1400 gm/sec output, after one week the output is decreased so I increased it to 50 Hz and got 700 gm/sec and with time it is decreased day after day to 300 gm/sec. I opened the line and checked the pump and have not notice any difference. How can I solve this issue?

RE: High viscous gear pump

I suspect the effective diameter of the hole inside the pipe is reducing over time.

Has temperature changed?

what size pipe? Velocity? Pressure? Pipe length?

But 25,000 cP is incredibly thick and close to solid.

If the temperature is not uniform then I suspect you are just solidifying the material on the outside of the pipe and effectively getting a smaller and smaller tube in which to try to push this material.

If you've increased the gear ump speed and flow is going down then your relief valve / recirculation line must be going at a higher and higher flow. Have you checked the pressure setting of this valve / relief system?

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

RE: High viscous gear pump

If the pump is cavitating due to restricted inlet flow that would account for increases pump speed and lower flow.

RE: High viscous gear pump

Good point - have you tried slowing the pump down instead of speeding it up?

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close